A good composition can turn an 'average' artwork into something memorable. It's more than just 'how to make things look nice'. A well thought-out composition can guide the eye of the viewer, telling a story in just one single image. Even artwork that's technically perfect can be boring if no real though was put into the composition.
It's not always the case, but composition often goes hand in hand with perspective. Many artists struggle with this (both beginners and more advanced), but a basic knowledge of perspective can really take your work to the next level. It's an essential tool for drawing credible backgrounds and landscapes.
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